Ratio of longest wavelengths corresponding to Lyman and from Class Physics Atoms
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    NEET Physics : Atoms

    Multiple Choice Questions

    81.

    The de-Broglie wavelength of an electron moving with a velocity c/2 (c = velocity of light in vacuum) is equal to the wavelength of a photon. The ratio of the kinetic energies of electron and photon is

    • 1 : 4

    • 1 : 2

    • 1 : 1

    • 2 : 1

    Answer
    • 82.

    The ionization energy of hydrogen is 13.6 eV. The energy of the photon released when an electron jumps from the first excited state (n = 2) to the ground state of a hydrogen atom is

    • 3.4 eV

    • 4.53 eV

    • 10.2 eV

    • 13.6 eV

    Answer
    • 83.

    The ratio of the de-Broglie wavelength of an α-particle and a proton of same kinetic energy is

    • 1 : 2

    • 1 : 1

    • 1 : 2

    • 4 : 1

    Answer
    • 84.

    Wavelength of light emitted from second orbit to first orbit in a hydrogen atom is

    • 6563 A∘

    • 4102 A∘

    • 4861 A∘

    • 1215 A∘

    Answer
    • 85.

    Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is

    • 527

    • 323

    • 729

    • 931

    Answer
    • 86.

    J.J. Thomson's cathode ray tube experiment demonstrated that

    • cathode rays are streams of negatively charged ions

    • all the mass of an atom is essentially in the nucleus

    • the e/m of electrons is much greater than the e/m of protons

    • the e/m ratio of the cathode ray particles changes when a different gas is placed in the discharge tube

    Answer
    • 87.

    The ionization potential of hydrogen is 13.6 V. The energy required to remove an electron from the second orbit of hydrogen is

    • 3.4 eV

    • 6.8 eV

    • 13.6 eV

    • 1.51 eV

    Answer
    • 88.

    The ionisation potential of hydrogen atom is -13.6 eV. An electron in the ground state of a hydrogen atoms absorbs a photon of energy 12.75 eV. How many different spectral line can one expect when the electron make a downward transition ?

    • 1

    • 4

    • 2

    • 6

    Answer
    • 89.

    If the electron in a hydrogen atom jumps from an orbit with level n1 = 2 to an orbit with level n2 = 1 the emitted radiation has a wavelength given by

    • λ = 53R

    • λ = 43R

    • λ = R4

    • λ = 3R4

    Answer
    • 90.

    Band spectrum is also called

    • molecular spectrum

    • atomic spectrum

    • flash spectrum

    • line absorption spectrum

    Answer
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